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The Sagging Roof

Posted: Wed Sep 05, 2018 9:36 am
by slapthecat
Mine is a 1990. Almost thirty years of supporting that AC. When I bought it, I noticed the roof was sagging a bit - the nose of the AC leaning forward and water pooling in front of the unit where the depression was - and when I painted the roof, I knew eventually I'd have to deal with it... eventually has arrived!!! The last few times I've run the AC, I've seen lots of condensation dripping back into the cabin. I thought it may have something to do with a clogged drain hole. It sorta does... the drain holes are now below the surface of the pooling water! The nose of the AC is resting on the roof. The water has nowhere to go. This is bad... this is so bad...

I'm guessing that a large portion of the roof will need to be cut out and replaced, with proper support - if that's possible?!?!
Has anyone dealt with this yet?!?! I'm very open to suggestions!!!

I'm looking for pictures of the roof in that area. Anyone that may have removed the ceiling panels and can see what is behind it all. Or replaced the AC and has a picture of the wood/fiberglass layering. I'm trying to understand how this thing is constructed to figure out how I'm going to remedy this...

Re: The Sagging Roof

Posted: Wed Sep 05, 2018 9:51 am
by tdashmike
Check out this thread and the particular post I made:
viewtopic.php?f=30&t=2854&start=15#p12232

My guess would be to either waterproof it very well or add material on top to compensate for the sagging. Maybe put a few layers or fiberglass on top would be the easiest way.

To really fix it would require a lot of work.
http://www.coachspecialists.com/sagging ... -fix-them/

Re: The Sagging Roof

Posted: Wed Jan 27, 2021 11:35 pm
by silvertrooper
I'm curious if anyone has put on a few layers of fiberglass, as suggested, to fill the sag in the roof? I was thinking about doing this with self-leveling sealant, as the sag in my roof is around the vent where I used that stuff anyway.

Re: The Sagging Roof

Posted: Fri Sep 17, 2021 1:04 am
by KathrynA
Mine drips right from the a/c unit... sometimes way more than dripping. It occurred to me today that the sag could be forming a pool that is above the sill of the a/c unit.

Re: The Sagging Roof

Posted: Wed Sep 22, 2021 9:46 pm
by slapthecat
Hmmm... ok.
What AC unit do you have? And where are you seeing the water drip from?

I ask because I have a newer Dometic Duo Therm and was recently having water POURING in when running it for a while. I turned out to be crumbled insulation under the outside cover that was allowing hot air (thats being pulled out of the van) to settle over the air intake (cold air) and causing mad condensation that dripped everywhere!